28221197390 has 16 divisors (see below), whose sum is σ = 50848319808. Its totient is φ = 11277331296.

The previous prime is 28221197377. The next prime is 28221197399. The reversal of 28221197390 is 9379112282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28221197399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1382822 + ... + 1403081.

It is an arithmetic number, because the mean of its divisors is an integer number (3178019988).

Almost surely, 2^28221197390 is an apocalyptic number.

28221197390 is a deficient number, since it is larger than the sum of its proper divisors (22627122418).

28221197390 is a wasteful number, since it uses less digits than its factorization.

28221197390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2786923.

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 28221197390 in words is "twenty-eight billion, two hundred twenty-one million, one hundred ninety-seven thousand, three hundred ninety".